asteroid vs space satellite

asteroid

noun
  • In the Solar system, such a body that orbits within the orbit of Jupiter 

  • Any member of the taxonomic class Asteroidea; a starfish 

  • A naturally occurring solid object, which is smaller than a planet, larger than a meteoroid and not a comet, that orbits a star and often has an irregular shape. 

space satellite

noun
  • A crewed or robotic spacecraft designed to orbit the Earth 

How often have the words asteroid and space satellite occurred in a corpus of books? (source: Google Ngram Viewer )